镁合金在直接化学镀前的活化处理时，表面生成一层氟化物 保护膜.溶解度计算及XPS分析表明，氟化物膜在镀液中可稳定存在.用SEM、XPS、SAM考察 了初始沉积Ni、镀层横截面以及开裂后的断面形貌与成分，发现在镀层与基体之间存在着 氟化物、镀液成分与Ni的混杂层.这一混杂层是镀层与基体结合的最薄弱环节，镀层开裂通 常首先发生在此混杂层内.
The theoretical calculation and XPS analysis show t hat the fluoride layer formed during activation in hydrogen fluoride acid dissol ves little in electroless plating bath.The adhesive characteristics of nickel co ating with the magnesium alloys matrix were studied by means of the analysis of the initially deposited nickel and the cross section of the coating as well as t he fracture surface by using TEM,XPS,SAM.It is shown that there exists a mixture co mpound layer above the matrix surface between the magnesium and the nickel coati ng,which consists of fluoride,nickel and the composition of plating bath.Fractur e usually occurs in the mixture layer which is the weakest link for the adhesion of nickel coating on the magnesium alloys.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%